My thoughts immediately went to "M" for "Magritte" (as in the Belgian surrealist artist René Magritte) and his famous image "
The Treachery of Images", depicting a tobacco pipe with the words "Ceci n'est pas une pipe" ("This is not a pipe").
I must also say that the image by Miguel Vallinas linked to earlier does have something of a Magritte-inspired look about it as a stepping stone between the two.
Turning to the telephone itself, I'm intrigued by the suffix "G". I'm familiar with:
"F" numbers-only dial
"L" dial with letters as well as numbers
"R" inclusion of earth recall
plus a couple of more obscure variations such as "S" and "T", but not "G".